Pump.



N. MoGARTY.

PUMP; APPLIOATION FILED JUNE 14, 1909.

' Patented Nov. 23, 1909 Show trot Norman M Car !y.

F. H u V O III attain? UNITED STATES PATENT oF-FioE.

NORMAN McCARTY, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO ATLAS ENGINE WORKS,

OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

PUMP.

Specification of Letters Patent.

Patented Nov. 23, 19cc.

Application filed June 14, 1909. Serial No. 502,042.

' the following is a specification.

The object of my invention is to produce a pump mechanism capable of the delivery of successive variable quantities of liquid fuel to an internal combustion engine, the construction being such that the amount of delivery to the engine maybe varied from zero to maximum.

The accompanying drawing, which is a vertical section, illustrates my invention.

In the drawings, 10 indicates a main pump -.body having a pump chamber 11 formed therein. Leadinginto the chamber 11 is a supply pipe 12 preferably provided with an inwardly opening check valve 13. Leading from the chamber 11 is a discharge passage 14. Mounted between chamber 11 and pas sage 14 is a discharge valve 15 which is preferably an inwardly opening valve normally seated in the seat 16 by means of a light sprin 17 the stem of valve 15 being extende through a suitable packing gland 18 and provided at its upper end with a head 10 against which the spring 17 acts. Beyond valve 15 the passage 14 may be provided, if desired, with an outwardly opening check valve 21. Projected into chamber 11 through a suitable packing gland 22 is a displacing plunger 23 which may be reciprocated by any suitable means such for instance as an arm 24 carried bythe eccentric strap 25 mounted upon eccentric 26 carried by the shaft 27 which may be driven by the engine which is to be supplied by the pump.

Leading from chamber 11 is an overflow passage 31in which is mounted an outwardly opening valve 32 said valve bein normally held closed by means which will hold the valve closed during the time when the valve '15 is open but will permit the opening of:

valve 32 when the valve 15 is closed'during the inward stroke of the displacing plunger 23. In the present form valve 32 is held closed by means of a spring 33 having a strength relative to valve 32 greater than the pressure against which the contents of chamber 11 are to be delivered through the discharge passage 14. For instance, if an internal combustion engine like a Diesel motor is to be supplied, where the pressures within the combustion chamber at the time of injection of fuel require an injecting air pressure of 1000 lbs. to the square inch, the.

spring 33 must have a strength relative to valve 32 sufiicient to holdsaid valve closed while plunger 23 is exerting a pressure sufficient to discharge oil from chamber 11 to the atomizer, but not too strong but that it will yield as soon as valve 15 is closed and thus prevent the bursting of the pump chamber during further inward displacing movement of the plunger 23.

. In order that measured variablequantities of liquid may be discharged from chamber 11 through passage 14, means needs. to be provided for controlling the time during which valve 15 is open. Forthis purpose a considerable variety of forms of mechanism may be provided. In the present drawings this valve controlling mechanism comprises a lever 41 provided at one end with a roller 42 adapted to engage head 19. The opposite end of lever 41 is connected at 43 with a link 44 which is connectedby a lever 45 with the eccentric arm 24, the link 45 being pivotally mounted at 46 upon one end of the link 47 so as to give suificientflexi-bilityfof mounting of the lever 45. The uppcr end of link 44 may be conveniently .slidingly mounted at 48 in a bracket 49 ,carried by the pump body. Lever 41 is provided at its middle with a slot 51 in which is mounted a fulcrum 52 said fulcrum being also mounted in a slot 53 formed in bracket 49 and being carried by an arm 54 which is attached to an eccentric strap 55 mounted upon an eccentric 56 carried by a rock shaft 57 which, in turn,- may be rocked by a link 58 connected in any suitable manner to a speed controlled governor. I

The operation is as follows: On the outward stroke of plunger 23 oil will be drawn into chamber 11 from pipe 12 and on tP: inward stroke of the plunger 23 oil will be :40 means for opening and closi'n discharged from chamber 11 past valve 15, which will be held open during the early portion of the stroke of plunger "23, into passage 14 and from thencelout beyond the check valve 21. At an intermediate point in the inward stroke of plunger 23, the exact time of which will depend upon the adjustment of fulcrum 52 relative to lever 51, wheel 42 will be withdrawn from head 19 lo and valve 15 will seat in seat 16 so as to prevent further outflow from chamber 11 through passage 14.- Plunger 23 will, however, continue to move inward and there:

upon the pressure within chamber 11 will be 15 suflicient to compress spring 33 so as to permit the excess of oil within chamber 11 to be'driven out through passage 31, the valve 33 seating immediately upon the completion of the inward stroke of plunger 23.

I claim as my invention:

1. In 'a pump having a main chamber, a

valved inlet passage, an outlet passage having an outwardly opening check-valve and an overflow passage, :1 displacing plunger associated with the pump chamber, a valve arranged in the outlet passage between the JPIIII'IP chamber and the outlet check-valve, said valve, means cooperating with said va ve for vary- .ing the time of opencondition of said valve [during the displacing stroke of the plunger, a valve arranged in the overflow passage, and means for holding saidrvalve closed while the valve of the outlet passage is open during the displacing movement of the plunger. 3. In a pump having a main chamber, a valved inlet "passage, an outlet passage havingan outwardly opening check-valve and an overflow passage, a displacing plun er associated with the pump chamber, a va ve arranged in the outlet passage'between the pump chamber and the outlet check-valve, means for opening and closing said valve, a valve arranged .in theoverflow passage, and

a spring normally closing said valve, said spring exceeding inst-rength the discharge pressurethrough the discharge passage.

4. In a pump having a main chamber, a valved inlet passage, an outlet passage having an outwardly openin check-valve and an overflow passage, a displacing plunger sage.

associated with the pump'chamber, a valve i arranged in the outlet passage between the,

pump chamber and the outlet check-valve, means for opening and closing said valve, means cooperating with said valve fol-varying the time of open condition of said valve during the displacing stroke of the plunger, a valve arranged in the overflow passage, and a spring normally closing said. valve,

said spring exceeding in strength the discharge pressure through the discharge pas- 5. In a pump having a main chamber, a valved inlet passage, an outlet passage having an outwardly opening check-valve and an overflow passage, a displacing plunger associated with the pump chamber, a valve arranged in the outlet passage between the pump chamber and the outlet check-valve, a. lever arranged to engage said valve to' open the same, intermediate connections between said lever and the plunger to cause an opening of the valve during the displacing stroke of the plunger, intermediate connections be-' tween the said lever and plunger, a valve arranged in the overflow passage, and means for holding said valve closed while the valve in the discharge passage is open during the displacing movement of the plunger.

,6. In a pump having a main chamber, a valved inlet passage, an outlet passage having an outwardly opening check-valve and an overflow passage, a displacing plunger associated with the pumpchamber, a valve arranged in the outlet passage between the pump chamber and the outlet check-valve, a lever arranged to engage said valve to open the same, intermediate connections between said lever and the plunger to cause .an opening of the valve during the displacing stroke of the plunger, means for varying the effect of said lever upon said valve to vary the duration of opening of the valve relative to the displacing movement of the plunger, intermediate connections between the said lever and plunger, a valve arranged in the overflow passage, and means for holding said valve closed while the valve in the discharge passage is open during the displacing movement of the plunger.

7. In a pump having a main chamber, a valved inlet passage,'-an outlet passage having an outwardly opening check-valve and an overflow passage, a 'displacing plunger associated with the ump chamber, a valve arranged in the outlet passage between the pump chamber and the. outlet check-valve, a lever arranged to engage said valve to open the same, intermediate connections between said lever and the plunger to cause an opening of the valve. during the displacing stroke of the plun er, a fulcrum for said lever, means for shlfting said fulcrum relative to the'lever to vary the ratio thereofij my hand and seal at Indianapolis, Indiana, intermediate connections between the said this fourth day of June, A. D. one thousand 1C lever;1v and plunger, a Halve arraiigedhiilidfhe nine hundred and nine. over ow a-ssage, an means or o n T 5 said valvg closed while the valve in mi IXORMAN MCCARTY' discharge passage is open during the dis- Witnesses: v placing movement of the plunger. l ARTHUR M. 11001),

In witness whereof, I, have hereunto set 1 THOMAS W. MGMEANS. 

